Read this: "If the battery is inside the passenger (in a hatchback vehicle or in a car with a back seat that folds down), you must use a sealed battery (i.e. Optima). If the battery is being used in the trunk of a vehicle you can use a standard battery but you will need put the battery in a battery box and you will need to provide proper ventillation. Proper ventillation would mean forced air (fan) ventilation from the battery box to the outside of the vehicle. When a standard lead acid battery charges, it produces flammable gases which must be removed from the vehicle to prevent a fire/explosion hazard." How to i go about getting a fan to ventilate my trunk? How and where do i install it? A sealed batt does or doesn't elliminate the need for this? I understand the concept but i don't know how to install or where to find a fan of this type. I knew someone who had 2 redtop batts behind the seat of a Ford Ranger and had no vent fan. So what do i do?